Analytical Sciences

Preparation and Certification of the New Reference Materials; Plastics (Disk Form, JSAC 0621 - 0625) for Determination of Mercury Using X-Ray Fluorescent Analysis

Kazuhiko NAKANO,*^1,*^2,*¹¹ Toshihiro NAKAMURA,*^3,*¹¹ Izumi NAKAI,*^4,*¹¹ Akira KAWASE,*^5,*¹¹ Makoto IMAI,*^6,*¹¹ Mikio HASEGAWA,*^6,*¹¹ Yohichi ISHIBASHI,*^7,*¹¹ Isamu INAMOTO,*^8,*¹¹ Kazuhuyu SUDOU,*^9,*¹¹ Masaru KOZAKI,*^10,*¹¹ Akira TSURUTA,*^10,*¹¹ Akihiro ONO,*¹¹ Kazutoshi KAKITA,*¹¹ and Mamoru SAKATA*¹¹

*1 Department of Applied Chemistry, Graduate School of Engineering, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi, Osaka 558-8585, Japan
*2 PRESTO, JST, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
*3 Department of Applied Chemistry, Meiji University, 1-1-1 Higashimata, Tama, Kawasaki 214-8571, Japan
*4 Department of Applied Chemistry, Tokyo University of Science, Kagurazaka, Shinjuku, Tokyo 162-8601, Japan
*5 SII NanoTechnology Inc., RBM Tsukiji Bldg., Shintomi 2-15-5, Chuo, Tokyo 104-0041, Japan
*6 Sumika Chemical Analysis Service, Ltd., 9-1 Kitasode, Sodegaura 299-0266, Japan
*7 JFE Techno-Research Corporation, 1-1 Minamiwatarida-cho, Kawasaki 210-0855, Japan
*8 Nippon Steel Technoresearch Corporation, Shintomi 20-1, Futtsu, Chiba 293-0011, Japan
*9 Mitsui Chemical Analysis & Consulting Service Inc., 580-32 Nagaura, Sodegaura 299-0265, Japan
*10 Environmental Technology Service Co. Ltd., 2-4 Nakaharashinmachi, Tobata, Kitakyusyu 804-0003, Japan
*11 The Committee for the Plastic CRMs for Hazardous Metals in The Japan Society for Analytical Chemistry, 1-26-2 Nishigotanda, Shinagawa, Tokyo 141-0031, Japan

The Japan Society for Analytical Chemistry has developed some new plastic certified reference materials (CRMs) for the analysis of mercury in polyester disks using XRF analysis. These CRMs (named as JSAC 0621 - 0625) were prepared by casting polyesters including a toluene solution of organometallic compounds as a standard. Concentrations of the five levels of mercury ranged from 0 to 250 mg/kg. Homogeneity tests of prepared disks had shown excellent results. Interlaboratory comparison study for the certification was performed by 15 laboratory participants. The z-scores in robust statistical method was applied for the evaluation of outliers. The certified values were assigned after discarding outliers. The uncertainties of certified values were determined as the confidence levels of 95%.

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